dt-bindings: arm: amlogic: add support for the Minix NEO U9-H

The Minix NEO U9-H is a small form-factor Android STB based on the
Amlogic Q200 reference board with an S912-H chip.

Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20210201210508.1528-1-christianshewitt@gmail.com